[command line mode] add upload and download parameter

[jianboy]

Please make sure of the following things

• [x] I have read the documentation.
• [X] I'm sure there are no duplicate issues or discussions.
• [X] I'm sure this feature is not implemented.
• [X] I'm sure it's a reasonable and popular requirement.

Description of the feature / 需求描述

upload

upload a file or folder from local dist.

./alist upload /src /dest

download

download a file or folder from cloud drive of alist.

./alist download /src /dest

Suggested solution / 实现思路

I found that it can run a task at background. So, when run "alist upload ...", you can submit a upload task(without uploading file from browser).

Additional context / 附件

No response

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